It is possible because of your high heart rate
and symptoms that you might have a tachycardia
or even an arrythmia
. Your symptoms could also be attributed to angina or Acute coronary syndrome
. It is important that you get yourself evaluated comprehensively. This includes many test done over a long period of time to monitor your heart rythm. You should contact a doctor who can conduct these for you so that more information on your condition can be obtained. Without these tests, it would not be appropriate to conclude it as mental.